I believe they have one at Texas Soaring Association. I too soloed in
a T-21, at RAF Bicester in the early 70's. As I recall it could at
least start to spin, as spin recovery training i.e. use the rudder not
the ailerons was part of the check out for solo. That solo was off of
the winch and lasted for all of 4 minutes. I still remember it
vividly.

David Martin